// On creation of a UUID object, set it's initial value
function UUID() {
	this.id = this.createUUID();
}

// When asked what this Object is, lie and return it's value
UUID.prototype.valueOf = function() {
	return this.id;
};
UUID.prototype.toString = function() {
	return this.id;
};

//
// INSTANCE SPECIFIC METHODS
//
UUID.prototype.createUUID = function() {
	//
	// Loose interpretation of the specification DCE 1.1: Remote Procedure Call
	// since JavaScript doesn't allow access to internal systems, the last 48
	// bits
	// of the node section is made up using a series of random numbers (6 octets
	// long).
	//  
	var dg = new Date(1582, 10, 15, 0, 0, 0, 0);
	var dc = new Date();
	var t = dc.getTime() - dg.getTime();
	var tl = UUID.getIntegerBits(t, 0, 31);
	var tm = UUID.getIntegerBits(t, 32, 47);
	var thv = UUID.getIntegerBits(t, 48, 59) + '1'; // version 1, security
													// version is 2
	var csar = UUID.getIntegerBits(UUID.rand(4095), 0, 7);
	var csl = UUID.getIntegerBits(UUID.rand(4095), 0, 7);
	// since detection of anything about the machine/browser is far to buggy,
	// include some more random numbers here
	// if NIC or an IP can be obtained reliably, that should be put in
	// here instead.
	var n = UUID.getIntegerBits(UUID.rand(8191), 0, 7)
			+ UUID.getIntegerBits(UUID.rand(8191), 8, 15)
			+ UUID.getIntegerBits(UUID.rand(8191), 0, 7)
			+ UUID.getIntegerBits(UUID.rand(8191), 8, 15)
			+ UUID.getIntegerBits(UUID.rand(8191), 0, 15); // this last number
															// is two octets
															// long
	return tl + tm + thv + csar + csl + n;
};

// Pull out only certain bits from a very large integer, used to get the time
// code information for the first part of a UUID. Will return zero's if there
// aren't enough bits to shift where it needs to.
UUID.getIntegerBits = function(val, start, end) {
	var base16 = UUID.returnBase(val, 16);
	var quadArray = new Array();
	var quadString = '';
	var i = 0;
	for (i = 0; i < base16.length; i++) {
		quadArray.push(base16.substring(i, i + 1));
	}
	for (i = Math.floor(start / 4); i <= Math.floor(end / 4); i++) {
		if (!quadArray[i] || quadArray[i] == '')
			quadString += '0';
		else
			quadString += quadArray[i];
	}
	return quadString;
};

// Replaced from the original function to leverage the built in methods in
// JavaScript. Thanks to Robert Kieffer for pointing this one out
UUID.returnBase = function(number, base) {
	return (number).toString(base).toUpperCase();
};

// pick a random number within a range of numbers
// int b rand(int a); where 0 <= b <= a
UUID.rand = function(max) {
	return Math.floor(Math.random() * (max + 1));
};